Fig. 2

Quantile regression graphs evaluating the correlation between estimated GFR and GFR measured by ^99mTc-DTPA renal dynamic imaging (mGFR). The solid lines indicate the regression line and the dashed lines indicate the 0.05 and 0.95 quantile. GFR, glomerular filtration rate; ^99mTc-DTPA, technetium-99 m-diethylene triamine pentaacetic acid; CKD-EPI, Chronic Kidney Disease-Epidemiology equation; EKFC, European Kidney Function Consortium equation; BIS1, Berlin Initiative Study-1 equation; LMR, Lund-Malmö Revised equation; BPNN, Back propagation neural network model; MDRD, Modification of Diet in Renal Disease equation